This is a note to let you know that I've just added the patch titled
drm/ttm/nouveau: don't call tt destroy callback on alloc failure.
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-ttm-nouveau-don-t-call-tt-destroy-callback-on-alloc-failure.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5de5b6ecf97a021f29403aa272cb4e03318ef586 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@xxxxxxxxxx>
Date: Tue, 28 Jul 2020 14:17:36 +1000
Subject: drm/ttm/nouveau: don't call tt destroy callback on alloc failure.
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From: Dave Airlie <airlied@xxxxxxxxxx>
commit 5de5b6ecf97a021f29403aa272cb4e03318ef586 upstream.
This is confusing, and from my reading of all the drivers only
nouveau got this right.
Just make the API act under driver control of it's own allocation
failing, and don't call destroy, if the page table fails to
create there is nothing to cleanup here.
(I'm willing to believe I've missed something here, so please
review deeply).
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200728041736.20689-1-airlied@xxxxxxxxx
[bwh: Backported to 4.14:
- Drop change in ttm_sg_tt_init()
- Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/nouveau/nouveau_sgdma.c | 9 +++------
drivers/gpu/drm/ttm/ttm_tt.c | 2 --
2 files changed, 3 insertions(+), 8 deletions(-)
--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -106,12 +106,9 @@ nouveau_sgdma_create_ttm(struct ttm_bo_d
else
nvbe->ttm.ttm.func = &nv50_sgdma_backend;
- if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
- /*
- * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
- * and thus our nouveau_sgdma_destroy() hook, so we don't need
- * to free nvbe here.
- */
+ if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page)) {
+ kfree(nvbe);
return NULL;
+ }
return &nvbe->ttm.ttm;
}
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -199,7 +199,6 @@ int ttm_tt_init(struct ttm_tt *ttm, stru
ttm_tt_alloc_page_directory(ttm);
if (!ttm->pages) {
- ttm_tt_destroy(ttm);
pr_err("Failed allocating page table\n");
return -ENOMEM;
}
@@ -232,7 +231,6 @@ int ttm_dma_tt_init(struct ttm_dma_tt *t
INIT_LIST_HEAD(&ttm_dma->pages_list);
ttm_dma_tt_alloc_page_directory(ttm_dma);
if (!ttm->pages) {
- ttm_tt_destroy(ttm);
pr_err("Failed allocating page table\n");
return -ENOMEM;
}
Patches currently in stable-queue which might be from airlied@xxxxxxxxxx are
queue-4.14/drm-ttm-nouveau-don-t-call-tt-destroy-callback-on-alloc-failure.patch
